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<pre class="textdiagram" id="fig29">
+-----------+
|           |       zmq_setsockopt (socket,
|   Client  |           ZMQ_IDENTITY, "Lucy", 4);
|           |
+-----------+       +---------+
|    REQ    |       |  Data   |     Client sends this
\-----+-----/       +---------+
      |
      |  "Hi, my name is Lucy"
      v
/-----------\       +---------+
|  ROUTER   |       | 'Lucy'  |     ROUTER uses identity of
+-----------+       +-+-------+     client as reply address
|           |       | |
|  Service  |       +-+-------+
|           |       |  Data   |
+-----------+       +---------+
</pre>
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